CN112311908A - Rear shell, manufacturing method of rear shell and mobile terminal - Google Patents
Rear shell, manufacturing method of rear shell and mobile terminal Download PDFInfo
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- CN112311908A CN112311908A CN201910672905.6A CN201910672905A CN112311908A CN 112311908 A CN112311908 A CN 112311908A CN 201910672905 A CN201910672905 A CN 201910672905A CN 112311908 A CN112311908 A CN 112311908A
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- blank
- metal frame
- substrate
- ceramic
- connecting layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0279—Improving the user comfort or ergonomics
- H04M1/0283—Improving the user comfort or ergonomics for providing a decorative aspect, e.g. customization of casings, exchangeable faceplate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
- H04M1/185—Improving the rigidity of the casing or resistance to shocks
Abstract
The application relates to a rear shell, a manufacturing method of the rear shell and a mobile terminal. The rear shell comprises a substrate, a connecting layer and a metal frame. The substrate is made of glass or ceramic and comprises an outer surface and an inner surface which are arranged oppositely. The articulamentum covers the internal surface and with base plate fixed connection, metal frame fixed connection in the articulamentum deviate from one side of base plate, and the metal frame locates the circumference edge of articulamentum, and the articulamentum forms the recess with the metal frame. Above-mentioned backshell, metal frame and base plate can make the backshell have better appearance characteristic. Because the connecting layer covers the inner surface of the substrate, the metal frame is fixedly connected with the substrate through the connecting layer, and after the rear shell is applied to the mobile terminal, the connecting layer can play a role in buffering when the mobile terminal falls accidentally, so that the substrate is prevented from being easily broken.
Description
Technical Field
The present disclosure relates to the field of mobile terminals, and in particular, to a rear housing, a method for manufacturing the rear housing, and a mobile terminal.
Background
The mobile terminal such as a smart phone can adopt a ceramic or glass battery cover to improve the appearance characteristic of the mobile terminal, but the ceramic or glass battery cover is easy to break when accidentally dropped.
Disclosure of Invention
The embodiment of the application discloses a rear shell in a first aspect, and aims to solve the problem that a ceramic or glass battery cover is easy to break when accidentally falling.
A rear housing, comprising:
the substrate is made of glass or ceramic and comprises an outer surface and an inner surface which are arranged oppositely;
the connecting layer covers the inner surface and is fixedly connected with the substrate; and
the metal frame, fixed connection in deviating from of articulamentum one side of base plate, just the metal frame is located the circumference edge of articulamentum, the articulamentum with the metal frame forms the recess.
Above-mentioned backshell, metal frame and base plate can make the backshell have better appearance characteristic. Because the connecting layer covers the inner surface of the substrate, the metal frame is fixedly connected with the substrate through the connecting layer, and after the rear shell is applied to the mobile terminal, the connecting layer can play a role in buffering when the mobile terminal falls accidentally, so that the substrate is prevented from being easily broken.
In one embodiment, the connecting layer is made of a polyamide and glass fiber composite material, or a polyphenylene sulfide and glass fiber composite material, or a saturated polyester butyl terephthalate and glass fiber composite material, or a polyaryletherketone and glass fiber composite material; the substrate, the connecting layer and the metal frame are subjected to injection molding.
In one embodiment, the inner surface is provided with a plurality of first micro holes, a side of the metal frame facing the substrate is provided with a plurality of second micro holes, and at least part of the connecting layer is accommodated in the first micro holes and the second micro holes.
In one embodiment, the first micropores have an average pore size of 150nm to 450nm, and the second micropores have an average pore size of 150nm to 450 nm.
In one embodiment, the substrate is of a 2.5D structure or a 3D structure, and the outer surface, the connection layer and the metal frame form a continuous contour curved surface on a side away from the groove.
In one embodiment, the connection layer is recessed at a side facing away from the substrate to form a part of the recess.
The second aspect of the embodiment of the application discloses a mobile terminal to solve the problem that a ceramic battery cover is easy to break when falling accidentally.
A mobile terminal comprises a display screen module and the rear shell of any one of the embodiments, wherein the display screen module is connected with a metal frame and at least partially accommodated in a groove.
The third aspect of the embodiment of the application discloses a manufacturing method of a rear shell, which aims to solve the problem that a ceramic battery cover is easy to crack when being accidentally dropped.
A method of manufacturing a rear housing, comprising the steps of:
preparing a ceramic substrate blank, wherein the ceramic substrate blank comprises a surface to be processed and an inner wall surface which are arranged oppositely;
preparing a metal frame blank;
performing injection molding on the ceramic substrate blank and the metal frame blank to form a connecting layer blank covering the inner wall surface on the inner wall surface, wherein the ceramic substrate blank and the metal frame blank are fixedly connected through the connecting layer blank to prepare a rear shell blank; and
and processing the rear shell blank to obtain the rear shell.
In one embodiment, the step of preparing the ceramic substrate blank includes:
preparing a ceramic rough blank by a dry pressing process, a casting process or an injection molding process, wherein the ceramic rough blank is an alumina ceramic rough blank or a zirconia ceramic rough blank, and the ceramic rough blank is subjected to glue discharging and sintering processes to form a ceramic blank; and
processing one side surface of the ceramic blank to form a plurality of first micropores, and preparing the ceramic substrate blank; the average pore diameter of the first micropores is 150nm to 450nm, and the surfaces where the plurality of first micropores are located are the inner wall surfaces of the ceramic substrate blank.
In one embodiment, in the step of preparing the metal frame blank, the method comprises the following steps:
preparing a frame rough blank by milling or die-casting molding; and
and processing the surface of one side of the frame rough blank to form a plurality of second micropores to obtain the metal frame blank, wherein the average pore diameter of the second micropores is 150-450 nm.
In one embodiment, the step of injection molding the ceramic substrate blank and the metal frame blank includes:
preheating the ceramic substrate blank and the metal frame blank to enable the temperature of the ceramic substrate blank and the temperature of the metal frame blank to reach 140-160 ℃;
preheating an injection mold to 140-160 ℃, respectively installing the ceramic substrate blank and the metal frame blank into the injection mold, and closing the mold;
raising the injection temperature of the injection mold to 260-280 ℃; adding the injection molding material into an injection mold, and setting the injection pressure of the injection mold to be 1200-1300 kgf; performing segmented pressure maintaining on the injection mold, wherein the pressure of the first segment of pressure maintaining is 550kgf-650kgf, the pressure maintaining time of the first segment is 1.4s-1.6s, the pressure of the second segment of pressure maintaining is 1900kgf-2100kgf, and the pressure maintaining time of the second segment is 2.5s-3.5 s;
cooling for 7.5-8.5 s to form the connecting layer blank and prepare the rear shell blank; and
and opening the mold, and taking out the rear shell blank.
In one embodiment, the step of processing the back shell blank comprises:
processing one side of the connecting layer blank, which is far away from the inner wall surface, and the metal frame blank to form a groove; and
processing one sides of the ceramic substrate blank, the connecting layer blank and the metal frame blank, which are far away from the groove, by taking the groove wall of the groove as a processing reference to obtain a ceramic substrate, a connecting layer and a metal frame; one side of the ceramic substrate, which is far away from the connecting layer, forms an outer surface, and the outer surface, the connecting layer and the metal frame form a continuous contour curved surface on one side, which is far away from the groove.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a mobile terminal in one embodiment;
FIG. 2 is a cross-sectional view of a rear housing of the mobile terminal in one embodiment;
fig. 3 is a sectional view of a rear case of a mobile terminal in another embodiment;
FIG. 4 is a cross-sectional view of a back shell blank in one embodiment;
FIG. 5 is a cross-sectional view of a back shell blank in another embodiment;
FIG. 6 is a flow chart of a method of manufacturing a backshell in one embodiment;
FIG. 7 is a flowchart of step S100 in an embodiment of the method of manufacturing the rear shell shown in FIG. 6;
FIG. 8 is a flowchart of step S300 of an embodiment of the method of manufacturing the rear shell shown in FIG. 6;
FIG. 9 is a flowchart of step S500 in an embodiment of the method for manufacturing the rear shell shown in FIG. 6;
fig. 10 is a flowchart of step S700 in an embodiment of the method for manufacturing the rear case shown in fig. 6.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As used herein, "terminal device" refers to a device capable of receiving and/or transmitting communication signals including, but not limited to, devices connected via any one or more of the following connections:
(1) via wireline connections, such as via Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connections;
(2) via a Wireless interface means such as a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter.
A terminal device arranged to communicate over a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:
(1) satellite or cellular telephones;
(2) personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities;
(3) radiotelephones, pagers, internet/intranet access, Web browsers, notebooks, calendars, Personal Digital Assistants (PDAs) equipped with Global Positioning System (GPS) receivers;
(4) conventional laptop and/or palmtop receivers;
(5) conventional laptop and/or palmtop radiotelephone transceivers, and the like.
Referring to fig. 1, in some embodiments, the mobile terminal 10 is a smart phone, and in other embodiments, the mobile terminal 10 may be a tablet computer, a palm game machine, or the like. The mobile terminal 10 is substantially rectangular and includes a display module 100 and a rear case 200, wherein the display module 100 is fixedly connected to the rear case 200. The Display screen module 100 may include an LCD (Liquid Crystal Display) screen or an OLED (Organic Light-Emitting Diode) screen, and the Display screen module 100 may be configured to Display information and provide an interactive interface for a user, an installation cavity may be formed between the rear case 200 and the Display screen module 100, so as to install electronic components such as a battery and a circuit board of the mobile terminal 10, the circuit board may integrate a processor, a storage unit, a power management module, a baseband chip, and the like of the mobile terminal 10, the battery may supply power to the circuit board and the Display screen module 100, and the circuit board may control Display of the Display screen module 100 through the control circuit.
Referring to fig. 2 and 3, the rear case 200 includes a substrate 210, a connection layer 220, and a metal bezel 230, and the metal bezel 230 and the substrate 210 are fixedly connected by the connection layer 220. Specifically, the substrate 210, the connection layer 220, and the metal bezel 230 are injection molded. The injection molding structure enables the connection layer 220 to form a stable connection with the substrate 210 and the metal frame 230, so as to improve the reliability of the connection. The substrate 210 is substantially rectangular block-shaped and is made of glass or ceramic. The substrate 210 includes an outer surface 211 and an inner surface 213 opposite to each other, and the connection layer 220 covers the inner surface 213 and is fixedly connected to the substrate 210, i.e. the connection layer 220 covers the inner surface 213 of the substrate 210. The metal frame 230 is fixedly connected to a side of the connection layer 220 away from the substrate 210, and the metal frame 230 is disposed at a circumferential edge of the connection layer 220. The metal frame 230 may be made of aluminum alloy, magnesium alloy, or stainless steel. The connection layer 220 and the metal frame 230 form a groove 201, the groove 201 can be used for accommodating electronic components such as a circuit board and a battery of the mobile terminal 10, and at least part of the display screen module 100 of the mobile terminal 10 is accommodated in the groove 201, so that the metal frame 230 is located at the periphery of the display screen module 100, and the display screen module 100 is supported, limited and protected. The inner surface 213 of the metal bezel 230, that is, the groove wall of the groove 201, may be provided with a plurality of fasteners for assembling the display screen module 100 or other structural members with the rear housing 200, so that the rear housing 200 can be firmly connected with the display screen module 100 or other structural members.
In some embodiments, the connection layer 220 is a composite material of Polyamide (PA) and Glass Fiber (GF), and the Glass Fiber is 10% to 90% by mass. For example, the glass fiber may be present in the polyamide and glass fiber composite material in an amount of 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% by weight. In other embodiments, the connection layer 220 may be a Polyphenylene Sulfide (PPS) and glass fiber composite material, and the glass fiber is 10% to 90% by mass. For example, the glass fiber may be present in the polyphenylene sulfide and glass fiber composite material in an amount of 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% by weight. In other embodiments, the connecting layer 220 may be a composite material of saturated Polyester Butyl Terephthalate (PBT) and glass fiber, and the glass fiber is 10% to 90% by mass. For example, the mass percentage of the glass fiber in the saturated polyester butyl terephthalate and glass fiber composite material may be 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%. In other embodiments, the connection layer 220 may be made of Polyaryletherketone (PAEK) and glass fiber composite material, and the mass percentage of the glass fiber is 10% to 90%. For example, the mass percentage of the glass fiber in the polyaryletherketone and glass fiber composite material may be 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%. The connection layer 220 made of the above materials is beneficial to injection molding processing, and can enable the metal frame 230 and the substrate 210 to form a stable connection. When the mobile terminal 10 is accidentally dropped, the connection layer 220 made of these materials can also have a good buffering and shock-absorbing effect, so as to prevent the substrate 210 made of glass or ceramic from being easily broken.
In the rear housing 200, the metal frame 230 can obtain various colors through a surface treatment process, so as to obtain a high aesthetic degree and have a good wear resistance, and the metal frame 230 can obtain a relatively high impact resistance. The substrate 210 made of ceramic or glass can obtain a high-gloss and fine-textured appearance surface, and can improve the appearance characteristics of the mobile terminal 10 when the rear case 200 is applied to the mobile terminal 10. Since the connection layer 220 covers the inner surface 213 of the substrate 210, the metal frame 230 and the substrate 210 are fixedly connected by the connection layer 220, and the metal frame 230 and the substrate 210 form a buffer region. The connection layer 220 can reduce the impact force transmitted from the metal bezel 230 to the substrate 210 when the mobile terminal 10 is accidentally dropped, and thus, the connection layer can play a role in buffering to prevent the substrate 210 from being easily broken. For example, after the metal bezel 230 is deformed due to an accidental drop of the mobile terminal 10, the substrate 210 is prevented from being easily broken due to the buffering and connection effect of the connection layer 220 on the substrate 210. For another example, when the outer surface 211 of the substrate 210 is impacted due to an accidental drop of the mobile terminal 10, the impact can be absorbed due to the connection and buffering effect of the connection layer 220, so as to prevent the substrate 210 from being easily broken. The injection-molded structure of the metal frame 230, the substrate 210 and the connection layer 220 can also form a reliable sealing structure between the metal frame 230 and the substrate 210, so as to improve the sealing performance of the mobile terminal 10. Because the substrate 210 is made of glass or ceramic, the substrate 210 has a small signal shielding effect on the mobile terminal 10, which is beneficial to ensuring the communication performance of the mobile terminal 10.
Further, the inner surface 213 of the substrate 210 is provided with a plurality of first micro holes, a side of the metal frame 230 facing the substrate 210 is provided with a plurality of second micro holes, and at least a portion of the connection layer 220 is received in the first micro holes and the second micro holes. In some embodiments, the first micropores have an average pore size of 150nm to 450nm and the second micropores have an average pore size of 150nm to 450 nm. For example, the average pore diameter of the first micropores and the average pore diameter of the second micropores may be 160nm to 200nm, or 210nm to 250nm, or 260nm to 300nm, or 310nm to 350nm, or 360nm to 400nm, or 410nm to 450 nm. The first micro-hole and the second micro-hole can be formed by a chemical etching process or a laser etching process. In the injection molding process, the melted injection molding material may be extruded into the first and second micro holes by pressurizing and maintaining the pressure of the melted injection molding material, so that the connection layer 220 is engaged with the substrate 210 through the first micro holes to form a firm connection, and the connection layer 220 is engaged with the metal frame 230 through the second micro holes to form a firm connection.
Referring to fig. 2, in some embodiments, the substrate 210 has a 2.5D structure, the inner surface 213 of the substrate 210 is planar, the edge of the outer surface 211 of the substrate 210 is curved, and the outer surface 211 of the substrate 210, the connection layer 220, and the metal frame 230 form a continuous curved contour on a side away from the groove 201, which can improve the appearance of the rear housing 200 and facilitate the user to hold. Referring to fig. 3, in other embodiments, the substrate 210 has a 3D structure, the outer surface 211 of the substrate 210 is curved at the edge, the inner surface 213 of the substrate 210 is also curved at the edge, and the outer surface 211 of the substrate 210, the connection layer 220, and the metal frame 230 form a continuous contour curve at a side away from the groove 201.
Further, referring to fig. 2 and 3, the connection layer 220 is recessed at a side facing away from the substrate 210 to form a portion of the groove 201, that is, in the thickness direction of the mobile terminal 10, an edge of the connection layer 220 protrudes out of a middle portion of the connection layer 220, so that the connection layer 220 has a structure in which the middle is recessed and both ends are protruded. Due to the arrangement, the light and thin design of the rear shell 200 can be realized, and the groove 201 has a relatively large volume while the connection strength of the connection layer 220, the substrate 210 and the metal frame 230 is maintained, so that electronic components of the mobile terminal 10 can be mounted, the compact arrangement of the electronic components can be realized, and the light and thin design of the mobile terminal 10 can be realized.
Referring to fig. 4, 5 and 6, the present application also provides a method of manufacturing the rear case 200, the method of manufacturing the rear case 200 including the steps of:
s100, preparing a ceramic substrate blank 310, where the ceramic substrate blank 310 includes a surface to be processed 311 and an inner wall surface 313 that are opposite to each other.
Specifically, referring to fig. 7, step S100 may specifically include the following steps:
s110, preparing a ceramic rough blank through a dry pressing process, a tape casting process or an injection molding process, wherein the ceramic rough blank is an alumina ceramic rough blank or a zirconia ceramic rough blank, and the ceramic rough blank is subjected to glue discharging and sintering processes to form a ceramic blank.
The dry pressing process includes adding small amount of adhesive into the powder material, pelletizing, loading into mold, pressing in a press to make the powder particles approach each other inside the mold and combine firmly via inner friction to form blank in certain shape. The dry pressing process has the advantages of high production efficiency, less labor, low rejection rate, short production period, high density and strength of the produced products, suitability for large-scale industrial production and the like. The tape casting is that the crushed powder and organic plasticizer solution are mixed according to a proper proportion to prepare slurry with a certain viscosity, the slurry flows down from a container, and is scraped and pressed by a scraper with a certain thickness to be coated on a special belt, after drying and solidification, the film is peeled off to form a film of a green belt, and then the green belt is subjected to processing treatments such as punching, laminating and the like according to the size and the shape of a finished product to prepare a blank to be sintered. Ceramic injection molding is to place ceramic powder in an injection mold and press the ceramic powder into a blank to be sintered by injecting molten material. After the ceramic rough blank is formed by any one of the processes, the ceramic rough blank needs to be subjected to glue discharging treatment, namely, the ceramic rough blank is subjected to heat preservation for a period of time at a certain temperature so as to decompose and discharge the adhesive. And after the glue discharging treatment is finished, sintering the formed rough blank to obtain the ceramic blank.
And S130, flattening the surface of one side of the ceramic blank to form a surface to be processed.
Specifically, a surface of one side of the ceramic blank may be ground or lapped by a numerically controlled grinder to flatten the surface of one side of the ceramic blank to form a surface to be processed. The surface to be processed has relatively high flatness, can be used for being matched and positioned with the surface of an injection mold, and can also be used as a reference surface for subsequent processing.
S150, processing the surface of the ceramic blank opposite to the surface to be processed to form a plurality of first micropores, and obtaining the ceramic substrate blank 310. The surface where the plurality of first fine holes are located is an inner wall surface 313 of the ceramic substrate blank 310.
The first micropores have an average pore diameter of 150nm to 450nm, for example, the first micropores may have an average pore diameter of 160nm to 200nm, or 210nm to 250nm, or 260nm to 300nm, or 310nm to 350nm, or 360nm to 400nm, or 410nm to 450 nm. The first micro-holes can be formed by a chemical etching process or a laser etching process.
S300, preparing a metal frame blank 320. It is understood that step S300 and step S100 may be independent of each other. For example, ceramic substrate blank 310 may be prepared first, or metal frame blank 320 may be prepared first.
Specifically, referring to fig. 8, step S300 may specifically include the following steps:
and S310, preparing a frame rough blank through milling or die-casting forming.
The frame rough blank can be made of aluminum alloy, magnesium alloy, stainless steel or the like.
S330, carrying out flattening treatment on the surface of one side of the frame rough blank to form a pre-treatment surface.
Specifically, a numerical control grinding machine may be used to grind or grind a side surface of the frame blank to flatten the side surface of the frame blank to form the pre-processed surface. The pre-processing surface has relatively high flatness, can be used for being matched and positioned with the surface of an injection mold, and can also be used as a reference surface for subsequent processing. The pretreatment surface may be an end surface of the frame blank or a side peripheral surface of the frame blank, and in the embodiment of the present application, the end surface of the frame blank is used as the pretreatment surface.
And S350, processing the surface of the frame rough blank, which is opposite to the pre-processing surface, to form a plurality of second micropores, so as to obtain the metal frame blank 320.
The second micropores have an average pore diameter of 150nm to 450nm, for example, the second micropores may have an average pore diameter of 160nm to 200nm, or 210nm to 250nm, or 260nm to 300nm, or 310nm to 350nm, or 360nm to 400nm, or 410nm to 450 nm. The second micro-holes can be formed by a chemical etching process or a laser etching process.
S500, ceramic substrate blank 310 and metal frame blank 320 are injection molded to form connecting layer blank 330 covering inner wall surface 313 on inner wall surface 313, as shown in fig. 4 and 5. The ceramic substrate blank 310 and the metal frame blank 320 are fixedly connected by the connecting layer blank 330 to produce the back shell blank 400.
Referring to fig. 4 and 5 in combination with fig. 9, step S500 may specifically include the following steps:
s510, preheating the ceramic substrate blank 310 and the metal frame blank 320 to enable the temperature of the ceramic substrate blank 310 and the metal frame blank 320 to reach 140-160 ℃. For example, the pre-heating temperature of the ceramic substrate blank 310 and the metal frame blank 320 may be about 145 ℃, or about 150 ℃, or about 155 ℃. In the embodiment of the present application, the temperature of the preheating is about 150 ℃.
S530, preheating the injection mold to 140-160 ℃, respectively installing the ceramic substrate blank 310 and the metal frame blank 320 into the injection mold, and closing the mold.
Specifically, the preheating temperature of the injection mold may be about 145 ℃, or about 150 ℃, or about 155 ℃. In the present embodiment, the preheating temperature of the injection mold is about 150 ℃, which is relatively close to the preheating temperature of the ceramic substrate blank 310 and the metal frame blank 320. In some embodiments, after the injection mold, the ceramic substrate blank 310 and the metal frame blank 320 are preheated respectively, the ceramic substrate blank 310 is embedded in the front mold and the surface to be processed is used as an assembly reference surface, the metal frame blank 320 is embedded in the rear mold and the preprocessed surface is used as an assembly reference surface, and the injection mold can be closed after the positioning is confirmed to be accurate. In another embodiment, the ceramic substrate blank 310 may be fitted into the front mold, the metal frame blank 320 may be fitted into the rear mold, the injection mold, the ceramic substrate blank 310, and the metal frame blank 320 may be preheated, and the molds may be closed.
S550, raising the injection molding temperature of the injection mold to 260-280 ℃; adding the injection molding material into an injection mold, and setting the injection pressure of the injection mold to be 1200-1300 kgf; and carrying out segmented pressure maintaining on the injection mold, wherein the pressure of the first segment of pressure maintaining is 550kgf-650kgf, the pressure of the first segment of pressure maintaining is 1.4s-1.6s, the pressure of the second segment of pressure maintaining is 1900kgf-2100kgf, and the pressure of the second segment of pressure maintaining is 2.5s-3.5 s.
Specifically, in some embodiments, the injection temperature of the injection mold is about 250 ℃, the injection pressure of the injection mold is about 1250kgf, the first dwell pressure is about 600kgf, the first dwell time is about 1.5s, the second dwell pressure is about 2000kgf, and the second dwell time is about 3 s.
In some embodiments, the material of the injection molding compound is a composite material of Polyamide (PA) and Glass Fiber (GF), and the mass percentage of the Glass Fiber is 10% to 90%. For example, the glass fiber may be present in the polyamide and glass fiber composite material in an amount of 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% by weight. In other embodiments, the material of the injection molding material may be Polyphenylene Sulfide (PPS) and glass fiber composite material, and the mass percentage of the glass fiber is 10% to 90%. For example, the glass fiber may be present in the polyphenylene sulfide and glass fiber composite material in an amount of 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90% by weight. In other embodiments, the material of the injection molding material may be a saturated Polyester Butyl Terephthalate (PBT) and a glass fiber composite material, and the mass percentage of the glass fiber is 10% to 90%. For example, the mass percentage of the glass fiber in the saturated polyester butyl terephthalate and glass fiber composite material may be 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%. In other embodiments, the material of the injection molding material may be Polyaryletherketone (PAEK) and glass fiber composite material, and the mass percentage of the glass fiber is 10% to 90%. For example, the mass percentage of the glass fiber in the polyaryletherketone and glass fiber composite material may be 10%, or 20%, or 30%, or 40%, or 50%, or 60%, or 70%, or 80%, or 90%. The injection molding materials are beneficial to injection molding processing, and can ensure that the metal frame blank 320 and the ceramic substrate blank 310 form stable connection.
And S570, cooling for 7.5S-8.5S to form the connecting layer blank 330 and obtain the rear shell blank 400.
Specifically, in some embodiments, the cooling time is about 8 s.
And S590, opening the mold, and taking out the rear shell blank 400.
After cooling, the injection mold is opened, and the back shell blank 400 can be taken out for further processing. The injection molded back cover blank 400 may have a 2D configuration as shown in fig. 4 or a 3D configuration as shown in fig. 5.
S700, processing the rear shell blank 400 to obtain the rear shell 200.
Specifically, referring to fig. 10, step S700 may specifically include the following steps:
s710, the side of the connecting layer blank 330 away from the inner wall surface 313 and the metal frame blank 320 are processed to form the groove 201. The structure of the groove 201 is shown in fig. 2 or fig. 3.
Specifically, the side of connecting layer blank 330 facing away from inner wall surface 313 and metal frame blank 320 may be machined to form groove 201, using the surface to be machined as a machining reference. In the processing process, a matching structure, such as a buckle, a clamping groove, an assembling surface, a through hole, a threaded hole, a sinking groove and the like, with the display screen module 100 or other structural members can be processed on the groove wall of the groove 201. After the groove wall processing of the groove 201 is completed, it can be further used as a reference for subsequent processing.
S730, using the groove wall of the groove 201 as a processing reference, processing the side of the ceramic substrate blank 310, the connecting layer blank 330, and the metal frame blank 320 away from the groove 201 to obtain the substrate 210, the connecting layer 220, and the metal frame 230. With reference to fig. 2 and 3, a side of the substrate 210 facing away from the connection layer 220 forms an outer surface 211 of the substrate 210, and the outer surface 211, the connection layer 220, and the metal frame 230 form a continuous contour curved surface on a side facing away from the groove 201. The formed rear case 200 may have a 2D structure as shown in fig. 2, or may have a 3D structure as shown in fig. 3. After the above processing steps are completed, burrs on the groove wall and other processing surfaces of the groove 201 can be further removed, and the appearance surfaces of the substrate 210, the connection layer 220 and the metal frame 230 are polished, colored and inspected completely, so that a finished product with good quality and capable of being assembled with the display screen module 100 or other structural components and electronic components is obtained.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A backshell, comprising:
the substrate is made of glass or ceramic and comprises an outer surface and an inner surface which are arranged oppositely;
the connecting layer covers the inner surface and is fixedly connected with the substrate; and
the metal frame, fixed connection in deviating from of articulamentum one side of base plate, just the metal frame is located the circumference edge of articulamentum, the articulamentum with the metal frame forms the recess.
2. The rear shell according to claim 1, wherein the connecting layer is made of a composite material of polyamide and glass fiber, or a composite material of polyphenylene sulfide and glass fiber, or a composite material of saturated polyester butyl terephthalate and glass fiber, or a composite material of polyaryletherketone and glass fiber; the substrate, the connecting layer and the metal frame are subjected to injection molding.
3. The rear housing of claim 2, wherein the inner surface has a plurality of first micro holes, a side of the metal bezel facing the substrate has a plurality of second micro holes, and at least a portion of the connection layer is received in the first micro holes and the second micro holes.
4. The rear cover according to claim 3, wherein the first micro-holes have an average pore size of 150nm to 450nm, and the second micro-holes have an average pore size of 150nm to 450 nm.
5. The rear cover according to any one of claims 1 to 4, wherein the substrate is of a 2.5D structure or a 3D structure, and the outer surface, the connection layer and the metal bezel form a continuous contour curve on a side facing away from the groove.
6. The rear cover according to any of claims 1-4, wherein the connection layer is recessed at a side facing away from the substrate forming part of the recess.
7. A mobile terminal, comprising a display screen module and the rear housing of any one of claims 1-6, wherein the display screen module is connected to the metal frame and at least partially received in the recess.
8. A method of manufacturing a rear housing, comprising the steps of:
preparing a ceramic substrate blank, wherein the ceramic substrate blank comprises a surface to be processed and an inner wall surface which are arranged oppositely;
preparing a metal frame blank;
performing injection molding on the ceramic substrate blank and the metal frame blank to form a connecting layer blank covering the inner wall surface on the inner wall surface, wherein the ceramic substrate blank and the metal frame blank are fixedly connected through the connecting layer blank to prepare a rear shell blank; and
and processing the rear shell blank to obtain the rear shell.
9. The method of manufacturing a rear case according to claim 8, wherein the step of preparing the ceramic substrate blank includes:
preparing a ceramic rough blank by a dry pressing process, a casting process or an injection molding process, wherein the ceramic rough blank is an alumina ceramic rough blank or a zirconia ceramic rough blank, and the ceramic rough blank is subjected to glue discharging and sintering processes to form a ceramic blank; and
processing one side surface of the ceramic blank to form a plurality of first micropores, and preparing the ceramic substrate blank; the average pore diameter of the first micropores is 150nm to 450nm, and the surfaces where the plurality of first micropores are located are the inner wall surfaces of the ceramic substrate blank.
10. The method for manufacturing a rear case according to claim 8, wherein the step of preparing the metal bezel blank includes:
preparing a frame rough blank by milling or die-casting molding; and
and processing the surface of one side of the frame rough blank to form a plurality of second micropores to obtain the metal frame blank, wherein the average pore diameter of the second micropores is 150-450 nm.
11. The method of claim 8, wherein the step of injection molding the ceramic substrate blank and the metal frame blank comprises:
preheating the ceramic substrate blank and the metal frame blank to enable the temperature of the ceramic substrate blank and the temperature of the metal frame blank to reach 140-160 ℃;
preheating an injection mold to 140-160 ℃, respectively installing the ceramic substrate blank and the metal frame blank into the injection mold, and closing the mold;
raising the injection temperature of the injection mold to 260-280 ℃; adding the injection molding material into an injection mold, and setting the injection pressure of the injection mold to be 1200-1300 kgf; performing segmented pressure maintaining on the injection mold, wherein the pressure of the first segment of pressure maintaining is 550kgf-650kgf, the pressure maintaining time of the first segment is 1.4s-1.6s, the pressure of the second segment of pressure maintaining is 1900kgf-2100kgf, and the pressure maintaining time of the second segment is 2.5s-3.5 s;
cooling for 7.5-8.5 s to form the connecting layer blank and prepare the rear shell blank; and
and opening the mold, and taking out the rear shell blank.
12. The method of manufacturing a rear case according to claim 11, wherein in the step of processing the rear case blank, the method includes:
processing one side of the connecting layer blank, which is far away from the inner wall surface, and the metal frame blank to form a groove; and
processing one sides of the ceramic substrate blank, the connecting layer blank and the metal frame blank, which are far away from the groove, by taking the groove wall of the groove as a processing reference to obtain a ceramic substrate, a connecting layer and a metal frame; one side of the ceramic substrate, which is far away from the connecting layer, forms an outer surface, and the outer surface, the connecting layer and the metal frame form a continuous contour curved surface on one side, which is far away from the groove.
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| CN201910672905.6A CN112311908A (en) | 2019-07-24 | 2019-07-24 | Rear shell, manufacturing method of rear shell and mobile terminal |
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| CN201910672905.6A CN112311908A (en) | 2019-07-24 | 2019-07-24 | Rear shell, manufacturing method of rear shell and mobile terminal |
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| CN112311908A true CN112311908A (en) | 2021-02-02 |
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